Ring traveller for spinning frames



July 25, 1967 Filed July 27, 1966 N. DRISCH ETAL RING TRAVELLER FOR SPINNING FRAMES 5 Sheets-Sheet 1 Inve IorS Mumgmd Ailorne y y 25, 1967 N. DRISCH ETAL RING TRAVELLER FOR SPINNING FRAMES Filed July 27, 1966 5 Sheets-Sheet 2 J ly 1967 N. DRlSCH ETAL 3,332,225

RING TRAVELLER FOR SPINNING FRAMES Filed u 27, 1966 5 Sheets-Sheet United States Patent 4 Claims. or. 57-125 The present invention relates to a traveller provided with a small roller for continuous ring spinning or ring twisting frames or for any other type of frame wherein twist is imparted to yarns with the aid of assemblies each of which comprises a ring and a traveller.

Various types of travellers having various shapes are used on the looms in question. One of these types is C-shaped and travels most frequently on the inner face of a circular ring having a vertical sliding track. The yarn passes, in this case, into the upper cranked portion of the traveller and its path is suddenly deflected at the level of the said cranked portion. It is thus subjected to a substantial degree of friction, even if the traveller is made of a more or less slippery material, such as for example polyamides or polytetrafluoroethylene.

Also further types of travellers are known, for example triangular travellers having three abutment points, or in the form of an arc of a circle or of a curved blade, these travellers being capable of travelling on a vertical, horizontal or oblique rings but wherein the yarn always travels within a cranked portion of the traveller.

However, there are also further travellers wherein the yarn travels into a hook or into an eyelet or a small flag secured externally on the body of the traveller, or even simply through an aperture formed in the body of the traveller.

At all events, even in these cases, the yarn frequently is subjected to a sudden deflection in its travel while at the same time being subjected to a certain degree of friction due to the tension exerted on the balloon of yarn upstream of the traveller, which said balloon causes the yarn to bear on the traveller.

The traveller forming the subject of the present invention permits a substantial diminution in the degree of friction exerted on the yarn. The said traveller is characteristic essentially in that it is provided with a moving roller over which the yarn passes, in such manner as to diminish to the minimum the frictional effect of the yarn on the traveller, during spinning, or during double twistmg.

The small roller may be associated with the body of the traveller in numerous ways, for example with the upper portion thereof, with its lower portion, or its median portion, externally or internally. It may be carried notably be a single or double angle member secured on the traveller in fixed manner with the aid of a screw, or moveably secured with the aid of a hinge or a ball device or in any other way. The angle member and the body of the traveller may also be cast in one piece.

The roller may be mounted on its support pivot, directly through the agency of its hub or indirectly with the aid of ball or roller bearings. The roller is preferably of the type having flanges with a pronounced groove between the flanges, so as to ensure improved guiding.

The use of a traveller provided with a small roller involves, however, the problem of orientation of the roller. In fact, it is preferable that the plane of symmetry of the roller should be identical with the plane formed by the two segments of the yarn immediately upstream and downstream of the roller, if it is desired to reduce the frictional effects on the yarn to the maximum extent.

If the dwnstream portion of yarn has the dimensions substantially of a straight line, the upstream yarn portion-which constitutes the baloon-forms a curved line due to the resistance opposed by the air and, strictly speaking, it is the tangent to this curve in the immediate vicinity of the roller which must be taken into consideration rat-her than a shorter segment of yarn immediately upstream. Nevertheless, if the length considered is only a few centimeters, the error relative to the orientation of the tangent is negligible.

Since the winding thickness increases constantly during winding-on, it is clear that the angular direction of the yarn downstream is continually modified. With regard to the yarn portion immediately upstream, the angular direction may be or may not be modified during windingon, depending on whether the yarn guide producing the yarn balloon point is fixed or whether it is subjected to displacement in sychronism with the ring rail. However, this modification is of small amplitude and it may, in practice, be assumed that the angular direction upstream is not modified, even in the case of a fixed yarn guide.

The problem of the effect of the increase in the winding thickness may be solved by utilizing a roller secured on the traveller by means of a ball-joint system, this arrangement automatically imparting the desired orientation thereto, at any instant. It is also possible to utilise a roller carried by a pivot the angular direction of which is variable relatively to the traveller, in such manner that the plane of symmetry of the roler is able to orientate itself between two extreme positions corresponding to the commencement and termination of winding-on. Finally, it is possible quite simply to use a roller having a pivot the angular direction of which is fixed relatively to the traveller, the plane of symmetry of the roller constituting in fact the plane bisecting the plane angle formed on the one hand by a short segment of yarn upstream and on the other hand by the two segments of yarn downstream, on the one hand at the commencement and on the other hand at the termination of winding-on. In this case, in particular, it is advantageous that the lateral flanges of the roller on either side of the groove should have an angle of inclination which is greater than or at least equal to that of the yarn travelling over the roller, relatively to the plane of symmetry of the roller. Furthermore, preferably the radius of curvature of the groove connecting the two lateral inclined flanges will be greater than the radius of the yarn passing about the roller. 7

Since the plane of symmetry of the traveller is inclined, due to the extremely rapid rotation of the traveller on the ring, and since this inclination is reversed depending on whether the twist is imparted in the S or in the Z direction, it follows that an S traveller the roller of which is carried by a fixed or rotating pivot cannot be used as a Z traveller and vice versa.

The traveller according to the invention may be utilised notably for twisting and doubling heavy yarns offering a relatively high degree of resistance to flexing and/ or covered with a layer of an adhesion or bonding agent, which may readily be removed, with a consequent risk of fraying or unravelling, due to yarn friction.

The traveller according to the invention is in particular suitable for the twisting of single threads or the cabling of glass filaments, intended for the reinforcement of pneumatic tires. In fact, these yarns and twisted filaments require first of all to be immersed in a solution of an adhering agent or bonding agent, so as to be thoroughly impregnated, and it is only after this treatment (with subsequent thermal treatment) that they may be subjected to twisting or cabling.

If ordinary travellers are used, even if these are made from a plastic material having a low coeflicient of friction, the yarn may be considerably damaged. Since the frictional effect is very great, the tension between the receiving bobbin and the traveller increases to an excessive extent and the turns are excessively tightened one on the other on the receiving bobbin.

The invention may be more readily understood with the aid of an exemplary embodiment of a traveller according to the invention, notably with the aid of FIGURES 1, 2, 3 and 4 in the accompanying sheets of drawings, but it is clear that this example is not intended in any way to limit the invention which may be extended to any other variant having the same underlying idea.

In the drawings:

FIGURES l and 2 show a traveller according to the invention, as seen from the front and from the side respectively;

FIGURE 3 shows a traveller in the active position on its ring; and

FIGURE 4 is a plane geometrical representation showing the orientation of the roller relative to the bobbin and to the winding.

Referring to FIGURES 1 and 2, it will be seen that the traveller is C-shaped, having a body 1 and two curved arms 2 and 3 each of which has inclined outer faces 4 and 5. Secured on the face 4 of the curved arm 2, by means of the screw 13, is an angle member 12. The angle member 12 carries, through intermediary of the screwthre-aded pivot and the nut 11, a small roller 6 having two flanges 7, 8 and a groove 9. The roller 6 is able to rotate freely on the pivot 10.

FIGURE 3 shows the same traveller in the working position on the ring 14 shortly after the feeding of yarn to the bobbin 15. Due to the forces exerted on the yarn travelling over the traveller, the position of the latter is inclined and the face 4 is orientated in such manner that the plane of symmetry of the roller 6 constitutes the plane bisecting the plane angle formed on the one hand by a short segment of yarn upstream of the traveller and on the other hand by the two segments of yarn downstream, on the one hand at the commencement and on the other hand by the two segments of yarn downstream, on the one hand at the commencement and on the other hand at the completion of the winding-on. The arrangement of the bisecting plane is shown more clearly in the plane illustration of FIGURE 4. The plane of symmetry of the roller 6, with these two flanges 7 and 8, is represented by the bisector X-Y of the angle ARB, wherein R represents the roller, RA the tangent drawn from R to the stern of the bobbin 15, and RB the tangent drawn in a similar manner to the yarn winding 17, when the latter has attained its maximum diameter.

According to the example of embodiment, for a bobbin stern having a diameter of 50 mm. and a winding having a maximum diameter of 100 mm., and for a ring having a diameter of 140 mm., the angles BRY and ARY have a value of the order of 13, whereas the angle ORY, 0 representing the pivot of the bobbin, has a value of the order of 33. In other words, at any point whatsoever on the ring, the angle of inclination of the roller to the tangent to the ring at that point is of the order of 33. In reality, this orientation varies slightly from the commencement to the completion of winding, due to the variation in the traction angle on the roller and due to the play which must necessarily exist between the roller and the support ring, and it will, if necessary, be possible to make use of this variable to determine the position of the bisecting plane with greater accuracy.

What is claimed is:

1. A ring traveller for a winding frame comprising a support member having arms disposed to slide around a ring and carrying means to guide a yarn from an external balloon onto a spindle, said guide means comprising a wheel having a peripheral groove formed by flanges adapted to receive and guide the yarn, means mounting said wheel on said support member for rotation about an axis lying in a plane substantially parallel to the plane of rotation of said traveller, said mounting means including a pivoted member adapted to permit swinging of said axis in said plane so as to accommodate the Wheel to the angle between the incoming and the outgoing yarn.

2. A ring traveller as set forth in claim 1 in which the support member is C-shaped and the mounting means includes an upstanding bracket pivoted to said support member and carrying said wheel.

3. A ring traveller as set forth in claim 1 in which said traveller rotates in a horizontal plane, said wheel is journalled for rotation about a horizontal axis, and said mounting is pivoted to provide for angular shifting of said axis in said plane.

4. A ring traveller as set forth in claim 1 in which said support member is C-shaped and carries an upstanding bracket pivoted to swing about a vertical axis and said wheel is journalled for rotation about a horizontal axis on said bracket whereby the wheel is free to assume a position determined by the angle between the incoming and the outgoing yarn.

References Cited UNITED STATES PATENTS 651,650 6/1900 Campbell et al. 57-125 2,020,873 11/1935 Bowen 57125 X 2,294,453 10/1942 Harrison 57-125 X FOREIGN PATENTS 296,224 8/1928 Great Britian.

STANLEY N. GILREATH, Primary Examiner.

W. H. SHROEDER, Assistant Examiner. 

1. A RING TRAVELLER FOR A WINDING FRAME COMPRISING A SUPPORT MEMBER HAVING ARMS DISPOSED TO SLIDE AROUND A RING AND CARRYING MEANS TO GUIDE A YARN FROM AN EXTERNAL BALLOON ONTO A SPINDLE, SAID GUIDE MEANS COMPRISING A WHEEL HAVING A PERIPHERAL GROOVE FORMED BY FLANGES ADAPTED TO RECEIVE AND GUIDE THE YARN, MEANS MOUNTING SAID WHEEL ON SAID SUPPORT MEMBER FOR ROTATION ABOUT AN AXIS LYING IN A PLANE SUBSTANTIALLY PARALLEL TO THE PLANE OF ROTATION OF SAID TRAVELLER, SAID MOUNTING MEANS INCLUDING A PIVOTED MEMBER ADAPTED TO PERMIT SWINGING OF SAID AXIS IN SAID PLANE SO AS TO ACCOMMODATE THE WHEEL TO THE ANGLE BETWEEN THE INCOMING AND THE OUTGOING YARN. 